de Weldon's theatrical debut was in the 1999 Los Angeles production of David Rabe's Streamers, receiving the Los Angeles TimesCritics' Choice. de Weldon went on to produce, direct and star in the 2003 LA production of Edward Albees’ The Zoo Story garnering the Los Angeles Times "Best LA Theater" by audience recognition. In 2006, he starred opposite Charles Dierkop in The Actors Studio presentation of Death of a Salesman. In 2007 de Weldon then produced and starred in the Los Angeles play, Danny and The Deep Blue Sea with Deborah Dir. This revival of the classic John Patrick Shanley play ran for eight months and received 15 acclaimed Critics' Choice. At the 29th Annual LA Weekly Theater AwardsDanny and The Deep Blue Sea was nominated for Best Two-Person Show and Best Production Design. In 2009, de Weldon starred opposite three-time Emmy Award-winning actress Barbara Bain in The Laramie Project:Ten Years Later at Grand Performances in Los Angeles, hosted by Glenn Close presented worldwide in 150 cities by satellite. de Weldon starred as the lead man opposite Frances Fisher in the 2013 production of A Muse of Fire.
Television
Presently de Weldon is starring in the lead male role of Young Doc Holliday in the upcoming TV series Badland WivesSully, Three Billboards Outside Ebbing, Missouri, Indian Horse, and Momentum- executive prods by Clint Eastwood for cable network television. Premiers Fall in Los Angeles. www.badlandwives.com
Film
On the screen, de Weldon's feature film credits include: Select Fit and The Bill ; Project Greenlight Official Selection, On The Lot finalist producer- Steven Spielberg, LA Shorts Fest Official Selection, top-five finalists for best film. de Weldon starred in The Night BeforeThe Morning After -Kansas City Film Fest Official Selection; Fortune's 500 ; and Amsterdam . He has taken on the role of film producer through his company Volition Entertainment Productions. The first film, The Elephant Ride stars de Weldon and is based on a true story. Currently attached to the project are producer David Hillary, Grammy award winner SEAL, Emmy award winner Armand Assante, and Wolfgang Hatz, aka Audi's "Mr. Engine". Also in development is the biopic based on the life of Daniel's father Felix de Weldon, titled Monumental. The film encapsulates his life and career as an artist. Daniel de Weldon is collaborating on the script with Allen Nalasco, and is slated to play the role of his father during the height of his career. Produced with Barry Krost Literary Management. Currently, de Weldon is starring in the upcoming feature films in 2019: V4 Vengeance, Buddha & Clyde, The Elephant Ride starring opposite Armand Assante, Seal, Robert Miano, Ilia Volok, Natalie Burn, Richard-John Seikaly, Monster In Love, and Weekend Warriors playing opposite Emmy and Golden Globe-nominated actor Corbin Bernsen and Jason London. Premiering in 2019, de Weldon stars in the feature films One Must Fall, Chaser, and Underdog. One Must Fall is directed by Antonio Pantoja and is an Official Selection for the Horrorhound Film Festival and premiered in March 2019 in Cincinnati, Ohio.